Javascript button not working for custom profiles

Question

I have a javascript button, which is used to get the field value, that field is not added to page layout. This button is working fine for system admin but for, custom profile its not working Javascript Code:

{!REQUIRESCRIPT("/soap/ajax/30.0/connection.js")} 
{!REQUIRESCRIPT("/soap/ajax/30.0/apex.js")} 

if('{!Order.Field__c}' != null){ 
window.parent.location.href=('/{!Order.Field__c}'); 
} 
else{ 
alert("Okay"); 
}

Thanks

Answer 1

You can't directly access field in this way because if field is not in layout salesforce does not store its value.

So now you have three options.

1. Add field on page layout and then refer here.

2. Query the field using sforce here and then check the value.

3. Or call an external webservice(Apex class) and then do the processing there.

I suggest go with option 1 or 2.